OI File Manger renaming PROBLEMS!

While using OI File Manager, I was renaming some pictures in my DCIM/100MEDIA folder(where all my photos go).

I accidentally chose to rename a picture that had the same name as an existing photo.
Instead of telling me that another file has the same name, and asking me if I wanted to continue, it just went ahead and replaced the other file!!

Could I get back my photos?
I ask that because, I can still see the replaced photos in Gallery, both in thumbnail and in full size.
However it doesn't let me edit it (e.g crop, rotate etc), and tells me there is a problem loading the file.